Propogation of uncertainty in a data set (finger-math at most)

Homework Statement

I have conducted a simple lab, that involves getting the distance traveled by a vertically falling weight at certain time intervals. Velocity is calculated for every time interval (distance traveled per time interval). Then I graph velocity versus time to get acceleration which comes out decently close to g.

Now the part I am confused about is calculating uncertainty for:
a) Velocity
b) Acceleration
c) y-intercept of velocity vs. time graph (acceleration line)

Absolute uncertainty for time is +-0.010s, and +-0.001m (1mm) for distance.

Homework Equations

The Attempt at a Solution

Since this is of a data set, you have many measured values, and it makes no sense to have a single relative uncertainty in the above equation. It would be different for each data point, correct?

Am I missing something from this concept? Or do I literally have to calculate out a different uncertainty for each velocity? Another possibility could be finding relative uncertainty for the first data point and using that % throughout the problem for all of them but that cant be right...